I'm not completely blind, but I don't think most people who are would consider thought to be a "sense", especially that cognitive voice in your head. Senses are a way to gain information, and thought is the way we interpret and process that information.

Thought is not a sense.
There are so many things sighted people don't think of, like proprioception, or spatial sense or sparial memory.
Colors can be something that the optic nerves still provide (noise) or something the brain fills in.

This is an interesting article. I wonder if this person still has his optic nerves intact. This might explain why he still sees colors even though he no longer has vision. I think it would be similar to people who lose a limb, yet they still feel tingling sensations where it used to be.

To answer your question though, I personally don't think of thought as a sense. I like to think of thought as information that you gather from using your other senses, such as sight, hearing, touch, etc etc.